Abstract

Organic solar cells were fabricated by inserting a thin rubrene fluorescent dye between pentacene and fullerene heterojunction with a multicharge separation(MCS) structure, which was adopted to inherently further improve maximum open circuit voltage and power conversion efficiency. The morphology of organic films showed that a more surface roughness of pentacene film could be beneficial for an effective MCS interface, exciton dissociation, and charge carrier transportation. Moreover, a slight improvement of short-circuit current density when adding a 1 or 2 nm rubrene layer was also analyzed in detail based on external quantum efficiency spectra and optical transfer matrix theory.

Received 26 October 2010Accepted 16 December 2010Published online 10 January 2011

Acknowledgments:

This work was supported by the National Science Foundation of China (NSFC) via Grant Nos. 60736005 and 60425101-1, the Foundation for Innovation Research Groups of the NSFC via Grant No. 60721001, the Doctoral Fund of Ministry of China via Grant No. 20090185110020, the SRF for ROCS, SEM via Grant No. GGRYJJ08-05, and the Young Excellent Project of Sichuan via Grant No. 09ZQ026-074.

Abstract

Organic solar cells were fabricated by inserting a thin rubrene fluorescent dye between pentacene and fullerene heterojunction with a multicharge separation(MCS) structure, which was adopted to inherently further improve maximum open circuit voltage and power conversion efficiency. The morphology of organic films showed that a more surface roughness of pentacene film could be beneficial for an effective MCS interface, exciton dissociation, and charge carrier transportation. Moreover, a slight improvement of short-circuit current density when adding a 1 or 2 nm rubrene layer was also analyzed in detail based on external quantum efficiency spectra and optical transfer matrix theory.

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Organic solar cells with a multicharge separation structure consisting of a thin rubrene fluorescent dye for open circuit voltage enhancement